--  @testpoint:opengauss关键字referencing(非保留)，作为函数名

--关键字不带引号-成功
drop function if exists referencing;
create function referencing(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function referencing;
--关键字带双引号-成功
drop function if exists "referencing";
create function "referencing"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "referencing";
--关键字带单引号-合理报错
drop function if exists 'referencing';
create function 'referencing'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `referencing`;
create function `referencing`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/